CVE-2026-64413

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place.

Impact & exploitability

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/29bf41a9b59aff9f6197df58641a00037d567ca8Patch
• https://git.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311faPatch
• https://git.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245efPatch
• https://git.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6Patch
• https://git.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088Patch
• https://git.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41cPatch
• https://git.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5Patch
• https://git.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbcPatch